> >you'd loose the real sender IP, that is, the one which
> >*is* sending you the message,
 
> Why?

Suppose someone from 31.11.43.121 tries to send to you an email
pretending to be "mail.example.com" and using "example.com" as the
sending domain (in email); ASSP sits behind the "proxy" so it only
sees the proxy IP (say 10.0.0.1) now, HOW can ASSP check SPF and DNSBL
to see if the incoming IP is ok ?

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